9.  The heights of 10 girls were measured in cm and the results are as follows:
       135, 150, 139, 128, 151, 132, 146, 149, 143, 141.
 (i) What is the height of the tallest girl?(ii) What is the height of the shortest girl?
  (iii) What is the range of the data? (iv) What is the mean height of the girls?
   (v) How many girls have heights more than the mean height.

Answers (1)

Given,

Heights of 10 girls (in cm) =  135, 150, 139, 128, 151, 132, 146, 149, 143, 141

Arranging the above data in ascending order = 128, 132, 135, 139, 141, 143, 146, 149, 150, 151

(i) Height of the tallest girl = 151\ cm

(ii) Height of the shortest girl = 128\ cm

(iii) Range of the data = (151 -128)\ cm

= 23\ cm

(iv)  We know, Arithmetic mean = \frac{sum\ of\ observations}{number\ of\ observation}

\\ = \frac{128+ 132+ 135+ 139+ 141+ 143+ 146+ 149+ 150+ 151}{10} \\ = \frac{1414}{10} \\ \\ = 141.4\ cm

Therefore, mean height of the girls is 141.4\ cm

(iv) Here, mean height = 141.4\ cm

And, 143, 146,149,150,151 are more than 141.4

Therefore, 5  girls have height more than the average height.

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